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您好, 在使用OMAPL138 evm过程中,我使用了MessageQ和ringIO来传输数据。利用ipcs -l ,情况如下:! j" F/ r% v0 c3 E% I8 t2 R7 ?
root@tl:~# ipcs -l
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7 R. K/ t. y5 L7 S------ Shared Memory Limits --------
5 h7 B4 q ~4 Q% s1 I: W. e3 Rmax number of segments = 4096: x# @( b0 D2 o8 ~/ B+ m
max seg size (kbytes) = 32768
1 m, I( v# a! V1 Q8 ymax total shared memory (kbytes) = 8388608
" q0 F% j! E( P8 omin seg size (bytes) = 1
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3 x- y" M2 T( L6 I! k* G------ Semaphore Limits --------
. u3 F3 M6 l) Y# x) R5 O7 x4 b! xmax number of arrays = 1289 L1 v; b9 V7 {4 x4 q8 R7 T
max semaphores per array = 250
' c) ~* i5 M' \' ~2 Qmax semaphores system wide = 320007 \0 A2 P( P* F& k1 j
max ops per semop call = 32
$ [5 w; ?! [- d ~" e# Nsemaphore max value = 32767' b/ w' }4 E6 N# L7 P# y
; ]% x! Y) \9 C. R- i6 y& B------ Messages Limits --------
% G' M* j' m9 vmax queues system wide = 178
8 q( N* p0 X7 n* J( kmax size of message (bytes) = 8192
, {+ _/ ^/ x' r; kdefault max size of queue (bytes) = 16384( G8 H* a; G. I+ B4 o
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( d2 H9 V' Q! v' m4 j- h但是,用ipcs -a
& k0 h3 T" @* _1 ^6 J( hroot@tl:~# ipcs -a; c0 `' _$ ^0 R1 B7 H
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------ Shared Memory Segments --------
; [5 g3 X z& k; Q" Q! ^- g% a9 ukey shmid owner perms bytes nattch status
5 } }7 l1 h4 {; q0 W7 u1 }9 M0 n0x00000000 0 root 600 1024 1 dest
4 k; V2 `5 b3 {% Y/ Q" B0x00000000 196609 root 600 1024 1 dest + s8 n' M( W- m5 p9 ]0 ~ d( i
# G$ [+ {! z; \9 s6 r) `' C1 N------ Semaphore Arrays --------( A# T7 @+ a1 E) _) S3 t: g& B
key semid owner perms nsems
6 F! h, Y( a8 N) Q% v) N6 b- w* i# ]0x6411074d 0 root 600 1
! ^2 W5 V; o# p( k F' I2 x$ I0x64110957 163841 root 600 1
8 Y' n$ _" e0 I0x641109a1 196610 root 600 1
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------ Message Queues --------7 Z" a5 R0 G, ~# L& Q
key msqid owner perms used-bytes messages
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$ P/ A. Y a; d, z( o; _请问,我的共享内存使用大小为 (float *)ring_buffer_acquired(ad->buffer, 2320 * sizeof(float)*18); 远大于1024BYTE ,请问为什么?) k6 n, Q3 u- S, G% s" z8 ^ L
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